| both(adjective, dual) |
| second(noun, adjective, adverb, double, duplication) |
| double(noun, adjective, double, duplication, couple) |
| dual(noun, adjective, double, couple, pair) |
| twin(noun, adjective, double, duplication, two) |
| pair(noun, group, same, accompaniment, two) |
| couple(noun, group, match, double, same) |
| brace(noun, group, combination, match, double) |
| deuce(noun, combination, match, double, couple) |
| duet(noun, group, same, accompaniment, two) |
| duo(noun, group, combination, match, same) |
| dyad(noun, combination, match, double, couple) |
| paired(adjective, double, twice as much) |
| twosome(noun, group, combination, match, same) |
| duplicated |
| span(noun, combination, match, double, couple) |
| doublet(noun, group, combination, match, double) |
| duplex(noun, adjective, double, duplication) |
| match(noun, group, combination, same, couple) |
| yoke(noun, group, combination, match, same) |